Electrochemical Characterization of Lithium-Ion Battery Cathode Materials with Aqueous Flowing Dispersions
Electrochemical Characterization of Lithium-Ion Battery Cathode Materials with Aqueous Flowing Dispersions
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DOI：
10.1016/j.electacta.2017.09.031
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发表时间：
2017-11
影响因子：
6.6
通讯作者：
Zhaoxiang Qi;Hong Dong;Gary M. Koenig
中科院分区：
文献类型：
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作者：
Zhaoxiang Qi;Hong Dong;Gary M. Koenig
使用多种材料表征技术对电池活性材料进行评估，以便在研究和开发过程中进行基本理解、比较分析以及在制造过程中进行质量控制。还需要研究和验证活性材料的电化学性质，并且这种分析非常耗时且材料密集，通常需要电极制造、电池组装和电池循环。此外，在电池单元中电化学地评估活性材料可能由于电极微结构和电池内不是活性材料的其他组分的贡献而变得复杂。在这份报告中，一种活性材料表征方法被证明可以通过将锂离子阴极材料分散到水性电解质中并流过电化学反应电池来提供对锂离子阴极材料的电化学见解。这种方法需要非常少的活性材料和时间来进行测量，通常需要低于0.1克的材料和少于10分钟。从该技术测量的电阻提供了对活性材料的电化学性能的了解，并且通常与倍率性能相关。由于没有电极制造步骤，因此测量的电阻对其他电极组件或电极微结构不敏感。选择LiFePO4作为该技术的初步演示的商业材料。
Battery active materials are evaluated using numerous material characterization techniques for fundamental understanding, comparative analysis during research and development, and for quality control during manufacturing. Electrochemical properties of the active materials also need to be investigated and validated, and this analysis is very time and material intensive generally requiring electrode fabrication, cell assembly and cell cycling. In addition, evaluating active materials electrochemically in battery cells can be complicated by the electrode microstructure and the contributions of other components within the cell that are not the active materials. In this report, an active material characterization method is demonstrated to provide electrochemical insights for lithium-ion cathode materials by dispersing them into aqueous electrolyte and flowing through an electrochemical reaction cell. This method requires very little active material and time to conduct the measurements, typically requiring under 0.1 grams of material and less than 10 minutes. The measured resistance from this technique provides insights into the electrochemical performance of the active material and generally correlates to the rate capability. This measured resistance is insensitive to other electrode components or electrode microstructure because there is no electrode fabrication step. LiFePO4was chosen as a commercial material for initial demonstration of the technique.